Invisible stitch from both sides of leather - Sewing Leather

So my mentor has been insistant that i must sew this bag through the edges of the leather like wo, similar to a butt stitch but the idea is for it to be invisible on both sides I really dont even think that is possible since we live on the land of physics. What do you guys think Below is what

How to sew an invisible zip - The Sewing Directory

Welting & Sewing The Soles Of Handmade Bespoke Shoes

More tips, tricks, and techniques for sewing leather

How To Sew & Repair Torn Seam on Leather of Vinyl Upholstery

How to sew an invisible stitch – Baukjen

How to Sew by Hand: A Beginner's Guide

Sewing Leather : 13 Steps - Instructables

How to Sew an Invisible Stitch: Your Ultimate Guide

how to sew a leather jacket

How to Finish a Saddle Stitch by Backstitching - Mr. Lentz Leather

How to Make Leather Stitching Look Good on Both Sides of a Project