Bava Batra 20B

דלית בה שיעורא; כדתנן: חרס ⁠– כדי ליתן בין פצים לחבירו.

The Talmud answers: This is referring to a case where the shard does not have the sufficient measure for ritual impurity, and is therefore considered insignificant. As we learned in a Mishnah (Shabbat 82a): One who carries a shard of earthenware on Shabbat is liable only if it is equivalent in size to that which is used to place between one pillar and another when they are piled on the ground, to strengthen the pillars.

כלי חרס ⁠– חזי ליה! דמיטנף. חזי לאומנא! דמנקב.

The baraita teaches: An earthenware vessel reduces the dimensions of a window. The Talmud challenges: But it is fit for one to use; therefore, it is likely to be removed from the window. The Talmud answers: This is referring to a case where the earthenware is dirty. The Talmud challenges: Even so, it is fit for a bloodletter to collect the blood. It would not matter to him if the earthenware were dirty. The Talmud answers: It is referring to a case where it is perforated and therefore unfit for that use.

ספר תורה ⁠– חזי למקרא! בבלוי. והא בעי גניזה! שם תהא גניזתה.

The baraita teaches: A Torah scroll reduces the dimensions of a window. The Talmud challenges: But it is fit for reading; therefore, it might be removed. The Talmud answers: This is referring to a Torah scroll that is worn out and unfit for reading. The Talmud challenges: But one is required to place the Torah scroll in a repository for unusable sacred books; therefore, he will certainly remove it to be stored away. The Talmud answers: This is referring to one who determines that its repository will be there. In other words, it was placed in the window with the intent of storing it there in its worn-out state.