optical illusion simply is tricking eyes and its so easy because most of time we are not 100 focusing we take a time to figure it beside some picture have more than one perspective here is some ideas for simple optical illusions:
photography optical illusion:
1- the easiest way to make an optical illusion photo is pick hug symbol or object and take a photo like this
2- or pick small object and do the same with it do look like you hold the object illusion
3-you can play with the light like this one , is it a woman breast or book pages its according to what your mind way of thinking lol
3-this one easy to make by collecting tow objects together like candle and glasses , also you can use mirrors
4-the black and white optical illusion or the" negative picture optical illusion " so easy by any photo editing program like Photoshop
5- this one needs two persons one is head and one covered his head with sands , the poor one lol
drawing optical illusion:
1-you can also draw it , its so cool way of optical illusion too here is a black and white human face picture but can you see the word "lair" ?
2- the four eyes illusion is cool too but it makes me feel dizzy :o
3-face painting so nice like this one you can sleep at working no one will know lol :D
or something fantastic like this
4- if you can paint and drawing more professional then open your imagination as you can you can paint as this
or maybe as this one ;)