I would say that since it would be a bit gross for Jesus to give us his actual blood and flesh to make it more appealing he turns it into them through the presit but still under the apperence of bread and wine so it’s nicer for us to enjoy and say imagine your at mass right before the transubstatation takes place and that god gave you some “magic” glasses and if your not wearing them you see what we as humans see and when you put them on you see what god sees so when the preist hold up the chalice you see the Holy Spirit etc come down and turn it into wine and when you take them off you just see the presit the glasses are back on and the preist is holding up the host and you see the Holy Spirit etc come down and the presit is holding a peice of flesh take them off and he’s holding up a Wafer
Hope this has helped
Chuck