Bizarre as it may sound, Dey has been devoting a major part of his day over the past three decades making these miniscule notebooks, some of which have won him laurels at home and beyond.
And now, the sexagenarian is on a new mission. He wants to inscribe Bhagwat Gita in three different languages on a little handmade notebook and tuck into a single mustard seed.
"From a 4inch by 2inch diary to 2inch by 1inch and now, I am making a handbook as little as of 0.35mm in length. I know it is hard to imagine," he said.
It all started accidentally, almost 30 years back. Just a day before submission, Dey's daughter Sanchita had misplaced her handmade school diary, a part of a work education project. The doting father promised her to make a replica of the diary overnight.
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"I came up with a 4inch by 3inch diary that morning with the leftover paper bought for her school project. To my surprise, it not only satisfied her, but also impressed the teachers. They wanted to keep it and requested for more such tiny notebooks for their personal collection," he said.
These days, he takes just a couple of hours to finish off one micro notebook. Today, the 60-something, non-descript person wants to be known as Microman.
Over the years, accolades have come in hordes. Limca Book of Records had chronicled his work in 1993. The Films Division of India did a documentary on him. Doordarshan dedicated a whole episode of Mirch Masala on his work.
"I did exhibitions across the country. My employer - ministry of defence - projected me in their flagship fair at Pragati Maidan in Delhi. My work had received mentions in local media that year," Dey said.
Lakhman Ghosh, 72, Dey's only assistant for three decades, lauded his friend's effort and zeal for perfection. "Mukul never gives up. His can spend hours on shaping the paper and cuts it like no micro-machine can do. He is meticulous about making the tools required to create microbooks," he said.
Calico, the main raw material for Dey's work, is made from unbleached and often less- processed cotton. "The fabric is far less fine than muslin, but less coarse and thicker than canvas or denim," he added.
The collection has touched over 12,000 now and it comprises tiny books and notebooks inserted in mustard seeds and dry Bengal gram.
"Passion, patience and perseverance are the three mantras that kept me hooked to my work over the last three decades and I want to keep on thinking small till the last day of my life," Dey signed off.